| | Organization Name(s) | Located In |
 | A Circle of Support, Autism Disorders | Richmond Hill |
| A Quality Mobility Inc | Richmond Hill |
| AAA Gates Wildlife Control | Scarborough |
| ABC, All Babies Count Prenatal Nutrition Program | Newmarket |
| | ABC, Co Ed Basketball | Newmarket |
| ABC Co-Ed Basketball | Richmond Hill |
| Ability Online | Toronto |
| ABLE Network (The) | Aurora |
| Aboriginal Legal Services | Toronto |
| AboutFace | Toronto |
| Abrigo Centre, Human Resources Skills Development Canada, Targeted Wage Subsidized Program | Greater Toronto Area |
| Academy Baldwin Nursery School | Aurora |
| Academy for Gifted Children | Richmond Hill |
| Academy of Learning | Richmond Hill |
| Academy of Sport and Fitness | Richmond Hill |
| Access Toronto | Toronto |
| Access Vaughan | Maple |
| Addiction Services for York Region | Aurora |
| Addiction Services for York Region, Community Withdrawal Management Services | Aurora |
| ADIR Charitable Foundation | Thornhill |
| Advertising Standards Canada, Consumer Complaints | Toronto |
| Advocacy Centre for The Elderly | Toronto |
| Ahmadiyya Muslim Jama`at Canada | Vaughan |
| Ahmadiyya Muslim Jama'at Canada, Baitul Islam Mosque | Maple |
| | AIDS and Sexual Health Infoline | Ontario |
| AIDS Committee of York Region | Newmarket |
| Aileen - Willowbrook Ratepayers Association | Thornhill |
| Air Cadets, 140 Aurora Squadron | Aurora |
| Air Cadets, 351 Silver Star Squadron, Royal Canadian Air Cadet Squadron - Unionville | Markham |
| Air Cadets, Richmond Hill Squadron | Richmond Hill |
| | Air Canada | Canada |
| Aish Hatorah, Thornhill Shul | Thornhill |
| | Al-Anon Alateen - Family Groups, Greater Toronto Al-Anon Information Services | Toronto |
| Alcohol Gaming Commission of Ontario | Toronto |
| | Alcoholics Anonymous | Greater Toronto Area |
| Alef Bet Daycare | Thornhill |
| Alexander Muir Retirement Residence | Newmarket |
| | All Our Kids, Early Child Development and Parenting Programs, Markham | Markham |
| | All Our Kids (AOK) -, Early Child Development and Parenting Programs | Newmarket |
| All Saints Anglican Church | King City |
| All Saints Chinese Church | Markham |
| All The King's Voices | Toronto |
| Allan Gardens Conservatory | Toronto |
| All-Care, Health & Staffing Services, Health Care Services | Richmond Hill |
| Allencourt Pharmacy, Delivery Service | Richmond Hill |
| | Alliance for a Better Georgina | Keswick |
| Alternatives Integrating People With Cognitive Challenges | Vaughan |
| | Altogether Arts Connection, B.A.C. Beach Arts Centre | Richmond Hill |
| Alzheimer Society of York Region | Newmarket |
| Alzheimer Society of York Region, Caregiver Support Group | Stouffville |
| Alzheimer Society of York Region, D.A.Y. South | Thornhill |
| Alzheimer's Foundation for Caregiving in Canada Inc | Richmond Hill |
| Amica at Newmarket | Newmarket |
| Amica At Swan Lake | Markham |
| Amici Dancing Club/Interclub Markham | Unionville |
| Amnesty International, Newmarket/Aurora Action Circle | Aurora |
| Among Friends, Best Friends | Aurora |
| Among Friends, Holy Spirit | Aurora |
| Amyotrophic Lateral Sclerosis Toronto Area Chapter | Toronto |
| Anaphylaxis Canada | Toronto |
| Angels From Heaven Youth Foundation | Vaughan |
| Anglican Parish of Christ Church, Stouffville (The) | Stouffville |
| Anglican Parish of Lloydtown, Christ Church Kettleby, Saint Aubans Nobleton, Saint Mary Magdaline, Schomberg | Schomberg |
| Angus Glen Older Adults | Unionville |
| Angus Glen Ratepayers Association | Unionville |
| Animal Alliance of Canada | Toronto |
| | Animal Services, Markham Animal Services | Markham |
| Animal Welfare, Pet Adoptions, Municipal Animal Control (Aurora, Markham, Richmond Hill) | Newmarket |
| Annswell Court Foundation | Thornhill |
| Annual Juried Spring Art Show | Markham |
| | Anonymous Employee | Canada |
| Aphasia Institute | Toronto |
| Aplastic Anemia and Myelodysplasia Association of Canada | Richmond Hill |
| Apostolic Lutheran Church of Toronto | Markham |
| Apple Creek Seventh Day Adventist Church | Markham |
| Applefest | Markham |
| Aqua Sub Scuba Diving Centre | Richmond Hill |
| ARCH Disability Law Centre | Toronto |
| Archives Association of Ontario | Toronto |
| Archives of Ontario | Toronto |
| Area Medical | Aurora |
| Armadale Chinese Seniors Program | Markham |
| Armadale Community Centre Older Adults | Milliken |
| Armadale Tennis Club | Markham |
| Armenian Evangelical Church | Markham |
| Art Gallery of Ontario | Toronto |
| Art In the Park | Markham |
| Art Psychotherapy Counselling Services, Art Therapy | Bradford |
| Arthritis Society, Toronto/Central East Region | Toronto |
| Arthur Murray Dance Studio | Richmond Hill |
| Arts Richmond Hill, Richmond Hill Arts Council | Richmond Hill |
| Arts Society King (ASK), ASK | Nobleton |
| Aspirals Gymnastics Centre | Concord |
| As-Sadiq Slamic School | Thornhill |
| | Assaulted Womens Helpline | Toronto |
| Assistive Devices Program, Ontario MOHLTC, (Includes the home oxygen program) | Toronto |
| Associated Hebrew School and Synagogue, Kamin | Thornhill |
| Associated Hebrew Schools of Toronto | Toronto |
| Association des francophones de la région de York | Aurora |
| | Association for Bright Children of Ontario, York North Chapter (York Region) | Aurora |
| Association for the Neurologically Disabled of Canada | Richmond Hill |
| Association of Chinese Canadian Entrepreneurs | Markham |
| Association of Differently Abled People Together | Newmarket |
| Association of Municipal Managers, Clerks and Treasurers of Ontario | Mississauga |
| Association of Ontario Midwives | Toronto |
| | Association of Parent Support Groups In Ontario Inc | Toronto |
| Atkinson College, York University, Division of Continuing Education | Toronto |
| | Atlantic Master Gardener Association | |
| | Attention Deficit Hyperactivity Disorder Support Group | Newmarket |
| | Attention Deficit Hyperactivity Disorder Support Group York Region | York Region |
| Aurora Skating Club | Aurora |
| Aurora Al-Anon Serenity Group, Aurora Alateen Group | Aurora |
| Aurora Badminton Club | Aurora |
| | Aurora Barbarians Rugby Football Club | Aurora |
| | Aurora Basketball League | Aurora |
| Aurora Bridge Club | Aurora |
| Aurora Cemetery Corporation | Aurora |
| Aurora Chamber of Commerce | Aurora |
| Aurora Chamber of Commerce, Aurora Street Festival | Aurora |
| Aurora Children's Centre | Aurora |
| Aurora Children's Centre, Cardinal Carter Child Care Centre | Aurora |
| Aurora Christian Community Church (ACCC) | Aurora |
| | Aurora Community Arboretum Inc | Aurora |
| Aurora Community Tennis Club | Aurora |
| Aurora Congregation of Jehovah's Witnesses | Aurora |
| Aurora Cornerstone Church | Aurora |
| Aurora Cultural Centre | Aurora |
| | Aurora Diggers Girls Softball Association | Aurora |
| Aurora Environmental Advisory Committee | Aurora |
| Aurora Film Circuit | Aurora |
| Aurora Food Pantry | Aurora |
| Aurora Garden and Horticultural Society | Aurora |
| Aurora Historical Society | Aurora |
| Aurora Ladies Volleyball League | Aurora |
| | Aurora Lawn Bowling Club | Aurora |
| | Aurora Master Ducks Swim Club | Aurora |
| Aurora Masters Lacrosse | Aurora |
| | Aurora Men's Slo-Pitch League | Aurora |
| | Aurora Minor Ball Association | Aurora |
| | Aurora Minor Hockey Association | Aurora |
| | Aurora Model Aircraft Club Incorporated | Stouffville |
| Aurora Performing Arts Group | Aurora |
| | Aurora Police and Community Together, PACT Aurora (Police and Community Together) | Aurora |
| Aurora Public Library | Aurora |
| Aurora Resthaven | Aurora |
| | Aurora Rovers Soccer Club | Aurora |
| | Aurora Salvation Army Kettle Drive, Northridge Community Church | Aurora |
| Aurora Selkies Adult Swim Team | Aurora |
| Aurora Soccer Club | Aurora |
| | Aurora Sports Dome | Aurora |
| Aurora Tigers | Aurora |
| Aurora United Church | Aurora |
| Aurora Village Co-operative | Aurora |
| Aurora Writers' Group | Aurora |
| Aurora YMCA Nursery School | Aurora |
| Aurora Youth Soccer Club | Aurora |
| Aurora. Town Of, Building Department | Aurora |
| Aurora. Town Of, By-Law Services | Aurora |
| Aurora. Town Of, Chief Administrative Officer | Aurora |
| Aurora. Town Of, Corporate and Financial Services | Aurora |
| Aurora. Town Of, Economic Development | Aurora |
| Aurora. Town Of, Mayor and Councillor's Office | Aurora |
| Aurora. Town Of, Parks & Recreation Services | Aurora |
| | Aurora. Town Of, Parks & Recreation Services, Atkinson Park | Aurora |
| | Aurora. Town Of, Parks & Recreation Services, Aurora War Memorial Peace Park | Aurora |
| | Aurora. Town Of, Parks & Recreation Services, Confederation Park | Aurora |
| | Aurora. Town Of, Parks & Recreation Services, Machell Park | Aurora |
| | Aurora. Town Of, Parks & Recreation Services, Ribfest | Aurora |
| | Aurora. Town Of, Parks & Recreation Services, Town Park | Aurora |
| | Aurora. Town Of, Parks & Recreation Services, Town Park, Splash Pad | Aurora |
| Aurora. Town Of, Parks & Recreation Services Department, Aurora Family Leisure Complex | Aurora |
| | Aurora. Town Of, Parks & Recreation Services Department, Flipside Skateboard Park | Aurora |
| Aurora. Town Of, Parks and Recreation Department, Aurora Community Centre | Aurora |
| Aurora. Town Of, Parks and Recreation Department, Aurora Recreation Complex | Aurora |
| Aurora. Town Of, Parks and Recreation Department, Aurora Seniors Centre | Aurora |
| Aurora. Town Of, Parks and Recreation Department, Canada Day Parade | Aurora |
| Aurora. Town Of, Youth Activities and Programs | Aurora |
| Auroran (The) | Aurora |
| | Aurora's Farmers Market | Aurora |
| | Aussie Pet Mobile, York Region | York Region |
| | Autism Children Intervention Services | Richmond Hill |
| Autism Ontario, York Region Chapter | Richmond Hill |
| Automobile Protection Association | Toronto |
| AWIC Community and Social Service | Toronto |
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